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I've been looking at Knowles and Sonion Armatures. I notice that all of the frequency charts just straight up cut of at 10,000hz. why is that, especially if they are a dual TWFK with a woofer and tweeter. it makes no sense.  how are these companies able to list drivers at 20hz-18khz when the frequency charts for the TWFK's dont even come close to that?  Is that where I need tuning Equipment? How does one tune a frequency of an armature or a dynamic driver?  Is there a special tool that I need?